<div class="simple">
  <?php echo CHtml::beginForm(); ?>
  <?php echo CHtml::activeDropDownList($this->module->getUserModel(),$this->module->userid,
  Chtml::listData($this->module->getUserModel()->findAll(), $this->module->userid, $this->module->username),
  array('size'=>1,'class'=>'dropdown','ajax' => array(
  'type'=>'POST',
  'url'=>array('authItem/showAssignments'),
  'update'=>'#assignments',
  ),
  'prompt'=>'select user'
  )); ?>
  <?php CHTml::endForm(); ?>
</div>
<div id="assignments">
  
</div>
